21235412000 has 192 divisors, whose sum is σ = 57435775488. Its totient is φ = 7651840000.

The previous prime is 21235411999. The next prime is 21235412041. The reversal of 21235412000 is 21453212.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4969865 + ... + 4974135.

It is an arithmetic number, because the mean of its divisors is an integer number (299144664).

Almost surely, 2^21235412000 is an apocalyptic number.

21235412000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21235412000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28717887744).

21235412000 is an abundant number, since it is smaller than the sum of its proper divisors (36200363488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21235412000 is a wasteful number, since it uses less digits than its factorization.

21235412000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4420 (or 4402 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 21235412000 its reverse (21453212), we get a palindrome (21256865212).

The spelling of 21235412000 in words is "twenty-one billion, two hundred thirty-five million, four hundred twelve thousand".